Sewing machine



April 1, 1947,

SEWING MACHINE Filed May 12, 1942 5 Sheets-Sheet l GEO/96E SAVE/i TTOR EY April 1, 1947. G. sAuER 2,418,429

SEWING MACHINE Filed May. 12, 1942- 5 Sheets-Sheet 2 INVENTOR GEORGE iSAi/Ef? B'Y I Z G ATTORNEY April 1, 1947. V G, SAUER 2,418,429

SEWING MACHINE Filed May 12, 1942 5 Sheets-Sheet 4 IN VEN TOR GEORGE 6AUEI? ATTORNEY April 1, 1947. GSAUER 2,418,429

SEWING MACHINE Filed May 12) 1942 5 Sheets-Sheet 5 IN VENTOR. GEORGE SAUER Patented Apr. 1, 1947 SEWING MACHINE George Sauer, Chicago, Ill., assignor to Union Special Machine Company, Chicago, 111., a corporation of Illinois Application May 12, 1942, Serial No. 442,585

Claims.

This invention relates to an improved sewing machine construction and more particularly to a power-driven sewing machine having associated therewith means for delivering a blast of cooling air into the region through which the needle or needles operate. A substantial increase in the speed of operation of the machine is made possible by the cooling action of such a blast.

As pointed out in the pending application of Charles F. Rubel, Serial No, 433,740, filed March '7, 1942, the speed of operation of many industrial sewing machines is limited by the tendency of the needles to become overheated. Overheating of the needles not only produces deleterious effects upon the needles themselves, shortening their lives, but also frequently causes damage to other portions of the machine, such as the loop takers. Moreover, it greatly increases the frequency of breakage of the needle thread and thus necessitates rethreading at more frequent intervals with consequent loss of operating time. This overheating tendency is particularly serious when the machine is operating upon heavier fabrics, such as denim, army twill, coated fabrics,

and the like. For a fuller discussion of the evils of needle overheating in the operation of a machine, reference may be had to said pending Rubel application.

A primary object of the present invention has been to provide a construction and arrangement of various means by which a blast of cooling air is generated upon the operation of the driving motor of the machine and is delivered to the zone of operation of the needleor needles. This construction and arrangement is such that the various parts may be easily manufactured at a minimum of cost and with the requirement of little or no special tool equipment. Toward this end, a feature of the invention is in the provision of a blower, all of the components of which may be formed from regular stock materials without the necessity of special tools. The blower housing may, for example, be formed of bar stock suitably out and shaped to form the major portion of th housing and having applied thereto, by welding or the 1ike, suitable adjuncts which are similarly formed from bar stock. While the housing is preferably made of steel or other metal, it may, if desired, be formed of suitable plastic materials.

Another featur of the blower is the production of the rotor element from a flat sheet or steel or the like by simply cutting out and bending up appropriate portions of the sheet to form vanes. The vane element so formed is preferably united with a backing sheet or disc which serves to eliminat vibration or weaving of the rotor and insures operation at high speed in a fixed plane. In so forming the rotor, it may be of extremely light weight so as to reduce to a minimum the extra load placed upon the regular sewing machine motor. Moreover, the centrifugal forces resulting from high speed rotation of the rotor element are held within permissible limits. The construction of the blower as a whole is such that it is adapted for use in connection either with a clockwise or a counter-clockwise driven motor.

Another object of the invention is to providea blower unit which may be readily mounted on a conventional sewing machine motor with suitable provisions for adjustment, enabling the housing to be correctly aligned in relation to the rotor, and with provisions for. the axial, shifting of the rotor incident to the clutching and declutching of the member driven by the motor. A feature of the invention in this connection is the provision of suitable devices, including an adjustable support, for mounting the blower on the conventional motor and clutch unit of existing machines without the necessity of modifying this unit. The construction is such, moreover that wear of the parts, such as theclutching faces, may be readily compensated by appropriate adjustment of the blower mounting devices. This enables application of the improved blower unit to existing motor and clutch units regardless of the condition of wear of the parts and at the same time allows for future wear.

A further object of the invention is the provision of suitable blower mounting means adapt- A still further object of the invention is the provision of convenient, simple and inexpensive means for delivering the blast of air developed by the blower to the region in which the needle or needies of the machin operate. A feature of the invention, in this connection, is the provision of a discharge conduit capable of being shifted readily from an active to an inactive position and vice versa. This enables ready access to the various portions of the machine for purposes of inspection, attention and repair and permits removal of the machine from its normal operating position. A further feature of this phase of the invention is the provision of a suitable connection between the blower and the shiftable discharge conduit which permits appropriate adjustment of the driving motor in" relation to the supporting table incident to the maintenance of proper belt tension. 7 Other objects, features and advantages or the game 3 invention will appear from the detailed description of an illustrative embodiment of the same which will now be given in conjunction withthe accompanying drawings, in which:

Fig. I is a front elevation-of a sewing machine on a supporting table, showing the improved air discharge conduit in association therewith, said conduit being shown in active position in full lines and a portion of the same {being shown in inactive position in broken lines,

Fig. II is comp-lemental to Fig. I and shows, in elevation, the driving motor and associated devices beneath the supporting table onwhich the sewing machine is mounted.

Fig. III is an end elevation of the motor and sewing machine viewed from the belt pulley end of the machine, a portion of the table and a portion of the blower housing being broken away for'clearness of illustration.

-'Fig. IV is a detail view in horizontal section along the line IVIV of Fig. III, showing the connection between the blower and discharge conduit.

Fig. V is a similar horizontal sectional view along the line VV of Fig. III.

Fig. VI is an enlarged detail View, partly in plan-and partly in section along the line VI-'VI of Fig. III, showing the blower and the means for mounting the same on the motor and clutch unit.

Fig. VII is an enlarged, horizontal-section along theline VII-VII of Fig. III, showing a detail of 'the conduitimounting means.

Fig. VIII is a sectional elevational view along the line VIIIVIIIof Fig. II.

Fig. IX is an exploded detail view, in plan, of the separate components which are united to formthe main central member of the blower housing.

Fig. -X is a viewof said member of the housing with its components permanently unitedv and Fig. XI is a plan view of one of the end plates of the-housing.

Referring now to the drawings, there is illustrated-a sewing table I on which is mounted a sewing -machine of any suitable construction. This-machine, asbest illustrated in Fig. I, is provided witha work support 3 over the surface of which the work is fed as it is operated upon by appropriate stitch-forming mechanism including one or more vertically reciprocable needlesd. It will be understood that appropriate complemental stitch-forming means are provided beneath-the work support 3 to cooperate with the needles as they pass through the work on thesupport. The needles 4 are carriedby a. needl'e bar amounted for vertical reciprocation in a needle head 6 at the free end of an overhanging arm 1 extending laterally from a vertical standard 8 forming a portion of the sewing machine frame. Power is supplied to the sewing machine for the operation of the stitch-forming devices through a combined pulley and hand-wheel 9 secured to the outer end of a main drive shaft extending through the wall of the machine frame. The connections from this main drive shaft to the various operating devices of the machine may be of any conventional or known construction, such as disclosed, for example, in the patent to Thompson et al. No. 2,107,918, granted Feb. 8, 1938. 'The pulley 9 is connected by a suitable belt 1.0 'with the driven pulley ll (Fig. II) of an electric transmitter or motor and clutch unit, designated generally by the reference numeral [2. This transmitter-unit may be of any suitable, known construction but for purposes of illustration the invention has been shown in combi-,

nation with a 'motor and clutch unit of the type shown and d'escribed in the patent to Max T. Voigt, No. 2,037,644, granted April 14, 1936. Briefly, this unit comprises an electric motor I3 secured to one end of a main frame member or housing [4 adjustably carried by the under surface of the table I through suitable mounting means to be hereinafter described. Within the housing Hi there is provided a flywheel which is I secured to the end of the motor shaft in the manner disclosed. in said Voigt patent. There is also provided within the housing 14 an axially shiftable clutch member having a conical surface adapted to .be engaged with a complemental friction surface on the flywheel whenever the sewing machine is to be operated and having an-' other face adapted to be engaged by a braking surface within the housing l4 whenever the'olutch is disengaged. This clutch construction'is f-ully disclosed in the Voigt patent. The shiftable clutch member above mentioned is secured to a shaft [5 (Fig. VI) which is adapted to be shifted axially, to engage and disengage the clutch, by the operation of a lever I6, The latter is pivoted at I! upon a lug l8 projecting from an end. plate l9 secured to the'end of the housing I4, in a manner to be described. The upper end of the lever 16 is bifurcated and its branches 20 extend'upwardly at opposite-sides of a collar 2| eXtend-ingforwardly from the-end-platel 9 around the shaft 15. Eachbranch 20 is forked 'orotherwise formed at its upper end to engage a projection- 22 extending radially outward from a sleeve 22a slidable axially within the collar extension 2l. and suitably connected-with the shaft l5. to impart endwise shifting movements to the latter. Projections 22 extend through slightly elongated. slots in the collar extension 2| to, permit the operation of thelever l6 and the axial shifting of the shaft IS in the manner described. The lever 16 is normally drawn by aspring 23 into the position indicated in Fig. II, in which the shaft 15 is held toward the right to disengage the driving faces of the clutch and engage the braking faces hereinbefore mentioned. Operation of the lever It, in opposition to the spring 23, may be effected in any suitable way, either manually or by a foo-t treadle. connected by a link 24 with the free end o-f-the lever. l'ne pulley wheel H is secured'to the shaft 15 and is driven thereby uporrengagement of the driving faces of the clutch. In engaging and disengaging the latter the pulley I lie shifted axially to'a limited extent with the shaft.

Referring particularly to Figs. II and III, the,

housing 14 is pivotally supportedat 25 upon ;a bracket 26 secured to the under surface ofthe table 1. For this purpose the top of the housing ld is provided with a'plate 21 having arearward and downwardextension which receives thepivot pin 25. The forward end of the plate 21 is angled upwardly and-is bifurcated to. receive a screwthreaded stud 28 pivotally connected at 29 to the bracketed By appropriate adjustment of the nuts 30, along the stud 28, the axis of the housing Hi maybe lifted or lowered slightly and the tension of thebelt it] may be varied. So also, by removal ofthe stud 28 from the forked extension of the plate 2], the motor unit may be lifted to assist in the removal and replacement of the belt or-themotor may be swung downwardly to facilitateinspectionand-repair. V g V g p The end-plate 19 is securedto'the housing 14 by means of a series of screw-threaded studs 3|,

sufficient length to pass through apertures in outwardly extending ears 32 on the end plate and to engage threaded apertures in ears 33 integral with the housing l4. Nuts 34 on the studs 3i serve to retain the parts in proper assembled relation. These nuts may be appropriately adjusted to any desired positions along the studs and serve to hold the end plate firmly against the end of the housing. Adjacent'the outer end of each stud 3! it is provided with an enlarged head 35, preferably of hexagonal configuration, to enable manipulation of the stud by a wrench. Beyond this enlarged head portion there is a reduced threaded portion 35 adapted to receive a nut 31. A support member 38, which is of substantially horseshoe or C-shape, as best shown in Fig. VIII, is mounted on the series of studs 3| and is clamped between the enlarged head portions 35 and the nuts 3'1. It will be seen that the mounting of the support member 38 is such that its position with relation to the end plate i 9 and with relation to the shaft 15 may be adjusted both angularly and axially. Each stud 31 may be adjusted independently of the others, for this purpose, so as to position the outer face of the head 35 at a greater or less distance, as desired, from the end plate l9. If they are all turned to equal extents, they will cause the support member to be adjusted axially with respect to shaft IE, but if they are turned unequally they will alter the angular position of the plane of the support member with respect to the shaft.

\ At opposite sides of the support member 38, preferably horizontally in line with the axis of the shaft it, there are provided threaded apertures 39 arranged to receive the threaded ends of a pair of wing-headed screws 40. These wingheaded screws are for the purpose of attaching to the support member 38 the housing of a blower unit, to be presently described.

The blower housing, in accordance with the present invention, is formed in an inexpensive manner and in a way adapting it for reversible connection with the support member 38. This permits the same blower to be applied either to a motor with a clockwise driven shaft or one with a counter-clockwise driven shaft. The housing comprises a main body member 4!, which may suitably be formed from a strip of steel appropriately bent into the volute form indicated in Fig. IX. The steel strip may, for example, be about of" an inch thick and '1 s of an inch wide. In lieu of steel, the strip may be formed of other metals or of appropriate plastic materials. If formed of material incapable of being'bent into the desired shape, the body member may be cast or molded in any appropriate form. Parallel with the end extension 32 of the member 4! there is provided a similar extension 43 suitably spaced to form an outlet passage. This extension 43 may be Welded or brazed or otherwise secured to the end at of the member 4!. At opposite sides of the member 4!, there may be attached, by welding, brazing or other means, suitable ears or lugs 35 apertured at it to receive the wing-headed screws it. To each face of the main body member there is secured, by screws or the like, a disklike member 41 conforming in outer contour with the contour of the member 4| and its extensions 42 and 43. The central portion of each disc 41 is cut out, as indicated at 48. A metal-cutting bands aw may be usedto form a number of the discs from sheet stock in a single operation. It will thus be seen that a blower housing is pro- 6.. vided which is of inexpensiveconstructionand' of relatively light weight. Moreover, it isof sturdy construction and at the same timeoccupies a minimum of space. If produced in the manner hereinabovespecified, it is susceptible of manufacture large quantities without the use of expensive tools, such as required for the pro-' ductionof stamped parts and the like. In attaching the blower housing to the support member 38,"

suitable spacing collars 49 are provided, these serving tospace the housing sufiiciently from the support member to allow adequate clearance for the pulley H and belt l0. Preferably each of the spacing collars 49 is formed with a pair of radially extending, screw-threaded apertures adapted to receive screws 59 for the attachment of abelt guard 5|.

A hub extension 52 of the belt pulley H i's pro-l vided on its outer face with a series of threaded apertures adapted to receive screws 55a for securing to the hub a rotor or impeller 55 (Fig. VI) of suitable construction. This impeller, as best shown in Figs. III and VI, is preferably formed by cutting out-suitable sections from a. circular disc and then bending up portions of the remaining metal or other material to form a series of vanes 55a. An ordinary metal-cutting band saw may be used to remove the portions of the original disc and also, if desired, in the formation of the disc itself from sheet stock. The material of which'the impeller vanes are thus formed may suitably be sheet steel or about .050 inch thickness. In order to eliminate vibration and weav ing in the operation of the rotor at high speeds, a backing disc 56 is preferably provided, this being of the same diameter as the tip diameter of the vane member. This backing disc may be of very light construction. It may suitably be formed of sheet steel of, say, .012 inch thickness. The vane member and backing disc may be secured in any suitable way, as by soldering the ends of the blades to the backing disc. A rotor of extremely light weight is thus produced and yet it is capable of developing adequate air flow for the required purposes with a minimum load upon the driving motor. While the specific di-' mensions of the rotor may be varied to suit the particular requirements of the blower, it has been found satisfactory, for the purposes of supplying a cooling blast of air to the region through which the needles of a sewing machine are operated, to employ a rotor having a vane tip diameter. of about 6 inches, the vanes projecting from the backing disc ab0ut' /1s of an inch. It will be understood that the size and contour of the main body member ii of the housing will be such as to provide the desired clearances with respect to the ends of the rotor vanes at all points to produce an efficient blower construction in accordance with accepted principles. It has been found that ablower constructed inaccordance with the foregoing will provide an adequate supply of air for the desired needle cooling purposes without placing any appreciable additional load upon the driving motor. Thus substantially the entire power of the motor is available to carry the load imposed by the regular sewing instrumentalities' messa e;

V beaadius edrboth ang arlyandv axia y w e spect. to theseparts by appropriate manipulation.

of. the. studs 3L andnut-s 351. Mereover, itwill be- Seen: thatthesmounting: of theblower housing is such that it. may be readily detached from the,

support member-:38 by loosenin of the. wing-,

headed-"screws without disturbing the adiustment of: the supportmember 38. Therefore, whenthe blower housing is tobe reattached, it. is simply necessary top-insert and tighten the wing-headed screws 49-. The apertures 43 in the face-plates of, the blower housing are of slightly larger diameter" than the hub; 52; of the pulley to provideadequate clearance. topermit the adjustments mentioned. By forming both of: the openings of the same size, it will be seen that: the blower; housing is made reversible so that the blower may be applied selectively or interchangeably to motor and clutch units driven. either in-a; clockwise or in. a counter-clockwise r ion. This reversibilityof the blower is made. DQSSiblealso by the relationship between the lugs 45, with their apertures 45, and the blower axis. This relationship is such that the centers of the apertures; tfizare equally distant from the axis of theblower; ir. e., from thecenters of the openings 48-and the axis of the shaft l5. It will be understood that the opening 48 onthe side of the blower housing opposite to that which is passed over :the hub-extension serves as the air inlet for; the blower.,

Theqbloweroutletvispfyrectangular form and isdefined: by the extensions. 42 and 43 of member 41; together with the correspondingportoins' of the-side plates 4-7; For the purpose of connectiing this outlet? with a conduit 53, which serves to. conduct. the blast of air to the. region: of the needle or" needles, as-will be presently explained, there is. preferably provided a: flexible member 54 which may suitably be formed of rubber, or a rubber substitute, or coated fabric, or the like. This mcmber'is adaptedto form an airtight connectionboth with the rectangular discharge out-v let of the-blowerand' with the tubularlower end: of the conduit. It may suitably be secured to the blower by means of screws 54a and may have a relatively tight sliding fit with the lower end of the conduit. for. purposes to be hereinafter. set forth.

The'c'onduitv 5 3 may be formed ofsteelorv other metal tubing or. may be: molded or extrudedorv otherwise formedrof an appropriate plastic composition. It is. preferably of rigid construction andpis-shaped to extend. from a point adjacent andslightly ii rrear'of .the. base: of the sewing ma:- chineqin'the. region of the vertical standard 8,-at

I which pointzthe conduit passes through the table l, to a point near the zone of operation of. the needle or. needles. At: the latter point the discharge outlet 52a. of. the conduit is,;arran'ged-to direct a streamofpooling air downwardly along and transversely"across-the. path-of. th needles" above: the, workisupport. The angular disposition of'the discharge end of'the conduit; ,itsdistancesfromthe needle. path, itsdiameter or area, and other related. factors are preferably in ac:- cordance with the. disclosure in said pending Rubel applications; N. 335 0:

That end of. the: conduit-which-passes; through the table! is retainedby'a: sleeve-,dglwhichexe tends-3 upwardly through anopening 58in the; table. To=facilitateassembly andadjustment. or the parts; 4a: substantial ;;c1ea:rance,:, is; preferablr provided between the sleeve and openingasshown" in Fig. III. At its lower end the sleeve is pro-- vided with alaterally extending arm 59 adapted. to be attached to the under urface'of the table- 1 b means of a number of screws 60. The upper end' -ofthe sleeve 51 is reduced slightly in its outer diameter to provide-a. shoulder 61 uponwhich a.

split collar 62 is supported. This collar surrounds the reduced ,portionof the sleeve and is adaptedto be clamped thereon by a screw 63 which may be turned by a small red or bar 64 slidable freely in an. aperture. formed in the enlarged head 65 of the screw. The upper end of the sleeve 51 issplit into four-segments by means'of a series of slots 66. which extend down to a pcintslightly below theshoulder El. It will be understood that when theclampingcollar 62 is. tightened upon the split. upper end of; the sleeve 51 by the turning of screw,

63. the split portions. of the sleeve will in turn clamp theiconduit 53.and. retain it firmly in what-- ever position it may have beenturned. Thus the conduit may be held in its active position with thedischarge. end as shown in Fig. Ior it may be.

swung; back into inoperative position whenever desired. This, for example, permits lifting or tilting of. the sewing, machine, in relation to the tablev whenever required for purposes of inspection or repair. A split collar, 61 arranged to be clamped upon the conduit by means of ascrew 68 servestosupport the conduit on the collar 62 and prevents the. conduit. from dropping lower in the sleeve 51.

The operation of the machineand its attach mentsis believed to be clear from the fore oing. Assuming the parts to be in the position indie cated in- Figs. I, II and III, the. blower rotor will be driven whenever the sewing machine is op-- erated under control of the. clutch. lever l6. Shiftingof the pulley H and the rotor. incident tothe. engagement of the clutch ispermitted by the clearances indicated in Fig. VI. The air blast developed by the blower and delivered through the conduit 53 to the zone abovethe work supportthroughwhich the. needles operate will serve to coolthe. needles sufficiently to permit a sub.- stantial increase inthe speed of operation ofv the machineon relatively heavy and tough materials. The cooling action will not only reduce needle breakagesand injury to other parts of the machine .but will reduce the needle thread break,- ages and. hence minimizethe loss of operating time due to re-threading.

Theclearance between thebacking. disc 56 of the rotor an thelplate 4.1 of the housin is sum-- cient tov allow not onlyfor the normal shifting of the-rotor-in the enga fiment of the clutch-but also to allow for ascertain amount of. wear of the clutchsurfaces. Ifthe clearance; becomes too small aftera long period of operation, the 60.

support member 38 may be adjusted axially, t0- war-dthe left in Fig. II, by appropriate. adjustmentv of the threaded studs 3i and the nuts 34. So also, if the wear'is irregular,. so that therotor is broughblclcser. to theend plate 41 of the hous ing; atone point or'another, relative angular ad-- justmentof these partsmaybe obtainedbya variable adjustment of the. several. screw-threaded. studs 3.! and nutsfid. 7

If. the drivingg beltshouldbreak, it may be replaced in the: following manner: The flexible sleeve-.54 maybe disconnected either from the conduit 53,-,or from'theoutlet of the blower. To. disconnect it. from the conduit the.v latterv may be; unclamped and raisedslightly. The blower housing rfmay then'be removed from the support by removing the wing-headed screws 46. This will not permit complete removal of the housing from the machine but it will allow a new belt to be passed over the rotor of the blower and onto the pulley ii. If desired, the housing may be disconnected in this way first and the sleeve 54 disconnected subsequently. In either case the belt may then be passed upwardly through the usual opening in the table I and applied over the pulley wheel 9. In order to permit the belt to be passed over this pulley wheel, the motor and clutch unit may be lifted by appropriate adjustment of the nuts 30 along the stud 28 or by disconnecting this stud from the forked extension of the top plate 27. After the belt has been properly positioned, it may be given the desired tension by appropriate adjustment of the nuts 30. The flexible connection 54 may then be re-applied and the blower housing may be attached to the support 33 by the wing-headed screws 40.

While an illustrative form of the invention has been described in considerable detail, it will be understood that numerous variations may be made in the construction and arrangement of the several parts without departing from the scope and principles of the invention. The terms and expressions used herein have been used as terms of description and not of limitation. However, the term angular adjustment as employed in the appended claims shall be understood to mean adjustment of the angle of the axes of the parts referred to in, relation to other parts as distinguished from the mere rotative position of the parts about their axes.

What I claim is:

1. In combination a sewing machine having stitch forming devices including a needle, means for operating said needle, power means including a motor and clutch unit for driving said needle operating means, said unit having a frame and a shaft journalled therein, said shaft being shiftable axially in the engagement and disengagement of the clutch of said unit, a blower having a rotor and a housing, the rotor being operatively connected with said shaft of said motor and clutch unit, a support member mounted on the frame of said motor and clutch unit for angular and axial adjustment in relation thereto, means for detachably connecting the blower housing in fixed relation to said support member, and a conduit for delivering air from said blower to the region in which said needle is operated, said angular and axial adjustment of said support member enabling proper clearance between the rotor therefor a driving motor including a frame structure, a rotatable shaft journaled in said frame structure and projecting therefrom, a pulley on said shaft operatively connected with said sewing machine, a blower including a rotor operatively associated with said shaft and disposed at the opposite side of said belt pulley from said driving motor, a blower housing surrounding said rotor, a discharge conduit extending from said blower to a point adjacent the zone of operation of the sewing machine needle, and devices for securing said blower housing to said driving motor frame structure, said devices including an intermediate member between said structure and .sewing machine, a series of bolts connecting said frame end member to the driving motor, a bracket member adjustably carried by said bolts, a blower rotor operatively associated with said shaft, a blower housing detachably connected with said bracket in definite position thereon and surrounding said rotor, and a conduit extending from the discharge side of said blower to a point adjacent the zone of operation of the needle of said sewing machine.

4. In combination a supporting table, a sewing machine mounted on said table, said machine having stitch forming means above said table, a motor unit beneath said table, a drivin connection between said unit and said machine for operating said stitch forming means, a blower associated with said motor unit and driven thereby, and a conduit arranged to deliver air from said blower to the region of operation of said stitch forming means, said motor unit and blower being hingedly mounted on said table and adjustable relative to said table, and said conduit having relatively slidable portions enabling such relative adjustment, said blower having its discharge outlet adjacent the axis along which the blower is hingedly mounted.

5. In combination a sewing machine having a part to be cooled, a motor and clutch unit for driving said machine, said unit having a frame and a shaft journaled in said frame, a blower associated with said unit, said blower comprising a housing and a rotor, a support member, means for mounting said support member on said frame for angular and axial adjustment relative thereto, means for detachably connecting said blower housing in definite relation with said support,

- means for independently connecting said rotor housing which is adjustably connected to one and I REFERENCES CITED The following references are, of record in the file of this patent:

UNITED STATES, PATENTS Number Name Date 2,144,326 Callaghan Jan. 17, 1939 2,278,082 Lofgren Mar. 31, 1942 1,758,101 Bates May 13, 1930 2,080,322 Le Vesconte May 11, 1937 2,082,738 Le Vesconte June 1, 1937 286,164 Robinson Oct. 2, 1882- 1,559,267 Lipschitz Oct. 27, 1925 2,037,644 Voigt Apr, 14, 1936 2,126,230 Troxell, Jr Aug. 9, 1938 1,453,055 Phelps Apr. 24, 1923 2,245,866 McLachlan June 17, 1941 829.017 Jordan Aug. 21, 1906 FOREIGN PATENTS Number Country Date 441,385 British Jan. 20, 1936 

